T1E1 Line Card
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OmniAccess 5740 Unified Services Gateway CLI Command Reference Guide
Alcatel-Lucent
LOOPBACK 
loopback {local|network {line|payload}}
DESCRIPTION
This command is entered in the Controller Configuration Mode. Use the loopback 
controller configuration command to put the T1 or E1 line into loopback mode. It 
can be used to verify connectivity.
PARAMETERS
DEFAULT VALUE
Loopback is disabled by default for T1 lines.
EXAMPLE
The following configuration establishes a loopback of the incoming T1 signal on 
controller T1 0:
ALU(config)#controller T1 1/0
ALU(config-controller T1)# loopback network line
NO CABLELENGTH
no cablelength 
This command is entered in the Controller Configuration Mode. This command is 
used to restore the value to its default.
NO CLOCKSOURCE
no clocksource
This command is entered in the Controller Configuration Mode. The “no” keyword 
sets the clocksource to its default.
Parameter Description
local The controller loops the internal signal back to the 
internal bus.
line The controller loops the external line signal back 
towards the network without reframing the signal.
payload The controller loops the external line signal back 
towards the network and reframes the signal.